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Bearing preload

Preload is a force acting between the rolling elements and bearing rings that is not caused by an external load. Preload can be regarded as negative internal clearance. Reasons to apply preload include:
  • enhanced stiffness
  • reduced noise level
  • improved shaft guidance
  • extended bearing service life
  • improved running accuracy
  • prevent skidding in high-speed applications during rapid starts and stops and under very light or no-load conditions

In the majority of high-precision applications preload is needed to enhance system rigidity.

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